摘要背景 准确评估角膜总屈光力对于白内障术中拟植入人工晶体屈光力的预测和角膜膨隆的诊断至关重要. 目的 研究GalileiⅡ双通道Scheimpflug眼前房分析系统评估激光原位角膜磨镶术(LASIK)术后角膜屈光力的可重复性,为其临床应用提供依据.方法 采用横断面研究设计,纳入2011年7-9月在温州医科大学附属眼视光医院接受LASIK的术后复查者36例68眼,术前受试者等效球镜度为-1.75 ～-10.00 D,平均(-4.95±2.08)D.利用GalileiⅡ双通道Scheimpflug眼前房分析系统对角膜模拟屈光力(SimK)、前表面屈光力(Ka)、后表面屈光力(Kp)、基于高斯厚透镜公式的总屈光力(KG)和基于光路追击原理的总屈光力(K.)进行测量,每眼重复测量3次.采用变异系数(CV)、标准差(SD)、Cronbach α系数及组内相关系数(ICC)对测量结果的可重复性进行评估,采用Bland-Altman法分析各次测量之间95％一致性区间(LoA). 结果 GalileiⅡ双通道Scheimpflug眼前房分析系统重复测量的SimK、Ka、Kp、KG和Kray参数的CV分别为0.24％、0.28％、-0.37％、0.31％和0.32％,Cronbach α系数均＞0.9,ICC均＞0.982.Bland-Altman分析显示各次测量结果之间的95％ LoA比较窄,SimK、Ka、Kp、KG和Kray的95％ LoA上下限绝对值的最大差值分别为0.37、0.46、0.09、0.45和0.49 D. 结论 GalileiⅡ双通道Scheimpflug眼前房分析系统检测LASIK术后角膜屈光力具有很好的可重复性,各次测量间的误差在临床上是可以接受的.

abstractsBackground The assessment of total corneal power is essential to both the prediction of intraocular lens power before cataract surgery and the diagnosis of corneal ectasia.Objective This study was to access the repeatability of corneal power measurements in post-laser assisted in-situ keratomileusis (LASIK) eyes with GalileiⅡ dual Scheimpflug analyzer.Methods In this cross-sectional study,68 eyes of 36 subjects who received LASIK surgery more than 3 months in Eye Hospital of Wenzhou Medical University were recruited from July to September in 2011.The mean preoperative spherical equivalent diopter was (-4.95±2.08) D in the subjects with the diopter range from-1.75 D to-10.00 D.The parameters of corneal power were measured by Galilei Ⅱ dual Scheimpflug analyzer,including SimK,Ka,Kp,KG and Kray.Three-time consecutive measurements were completed in every examined eye to obtain the data of SimK,Ka,Kp,KG and Kray,respectively.The coefficient of variation (CV),standard deviation (SD),Cronbach α coefficient and intra-class correlation coefficient (ICC) were calculated to evaluate the repeatability.Concordance between the different measurements was assessed using Bland-Altman agreement analysis.This study followed the Helsinki Declaration,all subjects signed informed consent.Results The CVs of three-time measured SimK,Ka,Kp,KG and Kray were 0.24％,0.28％,-0.37％,0.31％ and 0.32％,respectively,and the Cronbach α values were ＞0.9 and the ICCs were ＞0.982.The Bland-Altman analysis between different measurements showed that the maximum 95％ limits of agreement (LoA) were 0.37 D for SimK,0.46 D for Ka,0.09 D for Kp,0.45 D for KG and 0.49 D for Kray,respectively.Conclusions The Galilei Ⅱ dual Scheimpflug analyzer performed high repeatability and concordance on corneal power measurements in post-LASIK eyes.The differences between measuring results are clinically acceptable.